for a 2x2 table:
The first column and first row (the number in side is 3)means # of surgical
complication when protective approach chosen.
The second column and first row (the number in side is 16) means # of
surgical complication when non-protective approach chosen.
The first column and 2nd row (the number in side is 18) means # of non-
complication when protective approach chosen.
The 2nd column and 2nd row (the number in side is 65) means # of non-
complication when non-protective approach ch
